How long does a typical siding replacement project take from start to finish?

Most single-family homes take one to two weeks once work begins, depending on size, weather delays, and how much sheathing repair is needed underneath the old siding. Coastal properties with hidden moisture damage can add a few extra days once that's discovered during removal.

What should I ask a contractor before hiring them for siding work in Whatcom County?

Ask whether they're manufacturer-certified or trained on the specific product they're installing, and ask to see how they detail flashing around windows and roof lines, since that's where most water problems start. Also ask directly whether they install to the manufacturer's written specifications, since that affects whether the product warranty stays valid.

Is James Hardie siding actually better than cheaper alternatives, or is it just marketing?

It's a genuinely different substrate — non-combustible fiber cement with a factory-baked finish — rather than just a premium label on the same basic product. The real advantage in a climate like this is that the finish and substrate resist salt air and moisture better than field-painted wood or resin-coated engineered wood products.

What's the difference between James Hardie's HZ5 and HZ10 product lines?

HZ5 and HZ10 are engineered zone-specific formulations, with HZ10 built for colder, wetter climates and HZ5 for milder ones; the right choice depends on the specific site conditions of a property. We select the appropriate line based on the home's exposure and elevation rather than defaulting to one option everywhere.

Does the salt air near Blaine and Custer actually shorten the life of exterior siding?

Yes — airborne salt accelerates the breakdown of paint films and can speed up corrosion on fasteners and flashing, which is why materials relying on field-applied paint tend to need more frequent upkeep this close to the water. It's one of the main reasons we favor a factory-finished, non-combustible product for homes in this area.

Custer Siding Replacement: Salt Air & Rain Defense

Siding Built for Custer's Coastal Climate

Custer sits close enough to the water that salt air is a daily fact of life, not an occasional nuisance. Add Whatcom County's long wet season, persistent shade from mature evergreens on a lot of properties, and the moss and algae growth that comes with it, and you have a climate that is genuinely hard on exterior siding. We've worked on homes throughout this stretch of the county long enough to know which products hold up out here and which ones start showing problems inside of five to seven years.

This page walks through what Custer homes actually face, how we approach a siding replacement in this specific environment, and why we've standardized on one product system rather than offering a menu of options.

What the Climate Does to Siding Out Here

Salt Air and Corrosion

Proximity to Puget Sound and the Strait of Georgia means airborne salt is a constant, low-level presence. It doesn't just affect metal fasteners and flashing — it accelerates the breakdown of paint films and can work into seams and end cuts on wood-based products, speeding up rot from the inside out. Any siding material that depends on a field-applied paint job for its weather barrier is fighting an uphill battle here, because salt exposure shortens repaint cycles compared to inland areas.

Driving Rain

Storms coming off the water tend to arrive with wind-driven rain rather than straight-down rain. That matters because wind-driven rain gets pushed sideways into laps, seams, and butt joints — the exact spots where poor installation detail shows up first. A siding system's resistance to water intrusion depends as much on how it's installed (flashing, gaps, caulking strategy) as on the material itself.

Moss, Algae, and Shade

Many Custer properties sit under fir and cedar canopy or back up to greenbelt, which means long stretches of shade and slow-drying siding surfaces. That's ideal territory for moss and algae to establish, especially on north-facing walls and anywhere overhangs are shallow. Left alone, that growth holds moisture against the siding surface and accelerates whatever deterioration process is already underway.

Why We Only Install James Hardie Fiber Cement

We get asked fairly often why we don't offer vinyl, LP SmartSide, or one of the other fiber cement brands like Allura or Cemplank. The honest answer is that we've spent years watching how different materials perform in this exact climate, and we made a business decision to install only the product we trust to hold up under salt air, driving rain, and heavy moss pressure without turning into a maintenance project for the homeowner.

What We Ruled Out and Why

Vinyl siding: Lightweight and inexpensive, but it can warp or become brittle over time with temperature swings, and it doesn't stand up well to impact. It also relies heavily on caulking and lap fit for weather resistance, which is a weak point in wind-driven rain conditions.
LP SmartSide (engineered wood): A wood-strand product with a resin binder. It performs reasonably well when maintained perfectly, but any breach in the factory coating — a scratch, an unsealed cut edge, a failed caulk joint — gives moisture a path into a wood-based substrate. In a climate with this much sustained dampness and shade, that's a risk we're not willing to build a homeowner's project around.
Primed spruce or cedar: Real wood siding can look great, but it demands an ongoing repaint and recaulk schedule that gets more expensive to maintain the closer you are to salt air. We install it when a homeowner specifically wants that look, but we're upfront that it's the highest-maintenance option available.
Other fiber cement brands (Allura, Cemplank): These are legitimate fiber cement products and not inherently defective, but James Hardie is the manufacturer with the deepest track record, the widest color and profile selection, and a warranty structure we're comfortable standing behind on every job.

What James Hardie Gets Right

James Hardie fiber cement is non-combustible, doesn't rot, and holds its factory-applied ColorPlus finish far longer than field-painted alternatives — which matters directly here, since salt air is one of the fastest ways to degrade paint. Hardie also engineers specific product lines (HZ5, HZ10) calibrated to different climate zones, so the board itself is manufactured with regional moisture and freeze-thaw exposure in mind rather than being a one-size-fits-all product.

How a Custer Siding Replacement Typically Goes

Assessment and Moisture Check

We start by walking the exterior and checking the condition of the existing siding, sheathing, and any visible flashing details — particularly around windows, roof-to-wall intersections, and any north-facing walls that have been under shade or moss pressure for years. On older homes, this is often where we find the actual damage isn't cosmetic; it's water that's been getting behind the siding for a while.

Removal and Sheathing Repair

Once old siding is off, we can see the sheathing directly. Any soft or water-damaged sections get replaced before anything new goes up — installing new siding over compromised sheathing just hides the problem rather than solving it.

Weather-Resistive Barrier and Flashing

This is the step that determines how well a home handles wind-driven rain for the next 30 years. We install a proper weather-resistive barrier and detail flashing at every penetration, window, and horizontal transition, with particular attention to laps and overlaps given how much sideways rain this area sees.

Hardie Installation

We install to James Hardie's published fastening, clearance, and gapping specifications — including the ground clearance and roof-line clearances that keep splashback and moss-holding moisture away from the bottom courses. Installing to spec is also what keeps the manufacturer's warranty intact, which is not automatic if a job is done with shortcuts.

Comparing Siding Options for a Whatcom County Coastal Property

Material	Salt Air Resistance	Moisture/Moss Tolerance	Typical Maintenance
Vinyl	Fair — can fade and become brittle	Fair — depends on lap seal integrity	Occasional cleaning, no repainting needed
Primed Wood/Cedar	Poor without frequent repainting	Poor if coating fails	Repaint/recaulk every few years
LP SmartSide	Fair, coating-dependent	Weak point at cut edges/damage	Seal cut edges, monitor coating
James Hardie Fiber Cement	Strong, factory-baked finish	Strong, non-combustible and rot-proof substrate	Periodic wash, no repainting for years

Cost Factors for a Custer Project

Every property is different, so we don't publish blanket pricing, but a few factors consistently move the number for homes in this area:

Extent of hidden sheathing damage discovered during removal (common on shaded, moss-prone walls)
Home size and number of stories, which affects staging and labor time
Trim and detail complexity — gables, dormers, and multiple roof-wall intersections all add flashing work
Board profile and color selection within the James Hardie lineup
Whether roofing, window, or deck work is bundled into the same project

Why a Local Crew Matters Here

Custer isn't a generic climate zone on a spec sheet — it's a specific mix of coastal salt exposure, tree cover, and rainfall patterns that plays out differently than siding jobs 30 miles inland. A crew that works this part of Whatcom County regularly knows which walls tend to hold moss, which orientations need extra flashing attention, and how local wind patterns drive rain into laps that a textbook installation might miss. That local knowledge shows up in the small decisions made on-site, not just in the product on the truck.

Beyond Siding: Roofing, Windows, and Decks

Siding rarely fails in isolation. A roof that's shedding water poorly, windows with degraded flashing, or a deck ledger board holding moisture against the house can all undermine even a well-installed siding job. Because we handle roofing, windows, and decks as well as siding, we look at the whole exterior envelope during an assessment rather than treating siding as a standalone repair — which matters in a climate where water finds the weakest connection point first.

A Practical Pre-Project Checklist

Check for soft spots or visible staining near the bottom of exterior walls
Note any walls with persistent moss or algae growth, especially north-facing ones
Look for gaps, cracking, or peeling paint around window trim and corner boards
Check gutters and downspouts are directing water away from the foundation and siding base
Ask any contractor bidding the job whether they install to the manufacturer's written specifications, not just "to code"

If you're weighing a siding replacement in Custer, we're happy to walk the property, point out anything we see — good or bad — and put together a straightforward estimate. There's no pressure and no obligation; just a local, honest look at what your home actually needs.